[all variants] ubuntu inside ubuntu: no audio with VBox

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http://ubuntuforums.org – I have xubuntu (technically ubuntu with xubuntu-desktop installed) as a host system and minimalistic ubuntu as guest. Both uses ALSA. I've deinstalled pulse audio from host in purpose of making environment clear after discovering audio dysfunction. In both host and guest system user is a member of audio group and may use alsamixer freely (all channels are enabled). VirtualBox OSE is configured to use ALSA and provide Intel HD audio card. dmesg from guest tells me that it has successfully initialized Intel HD Audio card. I've got sample mp3, it was perfectly played in host machine. I've tried (Hardware)